From the perspective of dietetic aesthetics, this paper analyzes the reasons why Lu Yong 'an Building turned from prosperity to decline.

1. On the road, the quality and freshness of ingredients in Yong 'an Building played an important role in its transition from decline to prosperity. In the plot, Yong 'an Building uses a lot of fresh and high-quality ingredients, such as seafood, meat and vegetables. These ingredients provide a broad space for chefs to make, and also ensure the taste and quality of dishes.

2. In culinary aesthetics, the shape, color and taste of dishes will affect people's appetite and evaluation. On the road, the dishes in Yong 'an Building are beautifully designed, paying attention not only to the beautiful shape, but also to the taste and color matching.